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<head>
<script src="resources/audio-testing.js"></script>
<script src="resources/audiobuffersource-testing-legacy.js"></script>
<script src="../resources/js-test.js"></script>
</head>

<body>

<div id="description"></div>
<div id="console"></div>

<script>
description("Tests AudioBufferSourceNode start() with a variety of offsets and durations.");

// The following test cases assume an AudioBuffer of length 8 whose PCM data is a linear ramp, 0, 1, 2, 3,...

var tests = [

{ description: "start(when): implicitly play whole buffer from beginning to end",
  offsetFrame: "none", durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },

{ description: "start(when, 0): play whole buffer from beginning to end explicitly giving offset of 0",
  offsetFrame: 0, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },

{ description: "start(when, 0, 8_frames): play whole buffer from beginning to end explicitly giving offset of 0 and duration of 8 frames",
  offsetFrame: 0, durationFrames: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },

{ description: "start(when, 4_frames): play with explicit non-zero offset",
  offsetFrame: 4, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },

{ description: "start(when, 4_frames, 4_frames): play with explicit non-zero offset and duration",
  offsetFrame: 4, durationFrames: 4, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },

// Enable test when AudioBufferSourceNode hack is fixed: https://bugs.webkit.org/show_bug.cgi?id=77224
// { description: "start(when, 3_frames, 3_frames): play a middle section with explicit offset and duration",
//   offsetFrame: 3, durationFrames: 3, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },

];

var sampleRate = 44100;
var buffer;
var bufferFrameLength = 8;
var testSpacingFrames = 32;
var testSpacingSeconds = testSpacingFrames / sampleRate;
var totalRenderLengthFrames = tests.length * testSpacingFrames;

function runLoopTest(context, testNumber, test) {
    var source = context.createBufferSource();

    source.buffer = buffer;
    source.playbackRate.value = test.playbackRate;

    source.connect(context.destination);

    // Render each test one after the other, spaced apart by testSpacingSeconds.
    var startTime = testNumber * testSpacingSeconds;

    if (test.offsetFrame == "none" && test.durationFrames == "none") {
        source.start(startTime);
    } else if (test.durationFrames == "none") {
        var offset = test.offsetFrame / context.sampleRate;
        source.start(startTime, offset);
    } else {
        var offset = test.offsetFrame / context.sampleRate;
        var duration = test.durationFrames / context.sampleRate;
        source.start(startTime, offset, duration);
    }
}

function runTest() {
    window.jsTestIsAsync = true;

    // Create offline audio context.
    var context = new OfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
    buffer = createTestBuffer(context, bufferFrameLength);

    for (var i = 0; i < tests.length; ++i)
        runLoopTest(context, i, tests[i]);

    context.oncomplete = checkAllTests;
    context.startRendering();
}

runTest();

</script>
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